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KWL Broadcast is Indonesian manufacturer of FM and TV broadcasting equipment. Currently, we are covering four main areas :

  • FM transmitters
  • STL (Studio Transmiter Link)
  • TV transmitters
  • Transmitting antennas and accessories

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news  PRODUCTS
  TV TRANSMITTER (LOW POWER SERIES)



UHF or VHF All Solid-State Stereo (Zweiton or Nicam Available) TV transmitter (power variety from 10Watt to 600Watt peak sync.) is convenient to upgrade to digital TV signal transmitter, with all solid-state circuit design and combined amplification of video/audio carrier, and provide dual high quality TV exciters (composed by Stereo TV IF Modulator and IFCU/V - TV Up converter) for optional demands, which can guarantee the reliability and stability while TV signal is transmitting.

Features :

• With all-solid-state circuit design and combined transmission of video/audio carrier, convenient to upgrade to digital TV signal transmitter.

• With High Quality TV exciters (composed by Stereo TV IF Modulator and IFCU/V - TV Up converter) are able to guarantee the reliability and stability of TV signal transmission.

• Advanced RF non-linear pre-correction technology is able to make the whole equipment work under super-linear state and low the RF distortion.

• With super-linearity broadband amplifier unit and modularized design power amplifier, and adopted LDMOS high-power FET, this device has great redundancy and easy to install and maintenance.

• With over-voltage, over-current, over-heat, over-excitation, low-voltage, short-circuit and over-VSWR auto-protective functions, it could run securely.

• Wide voltage stability range and high efficiency, Linear system power supply.

• Forced-air-cooling design with low power consumption and low noise.

• High-quality. The video quality of IF Modulator represents the right step just before the DTV generation. Using a new back-porch clamping circuit, combined with linearity corrector it’s possible to obtain a perfect video quality with negligible distortions and intermodulations. All this means a superior video modulation quality.

• Compatible with all TV standards. These IF Modulator is fully compatible with all video standards (PAL, NTSC, SECAM) and is available for B,G,M,N,I,D,K,K1 and L modulation systems. These professional multi standard TV IF Modulator is designed to produce sound and vision modulated signals at any standard intermediate frequency.

• Vestigial sideband SAW filter. For a perfect vestigial sideband modulation an high quality SAW filter is used complying with all international standards. These filters outstand for their excellent phase linearity and flat pass-band and group-delay characteristics.

• Group delay pre-correction. TV receiver group delay pre-correction is available for all standards (optional).

• White clipper & Video Emphasized. The white clipper & Video Emphasized have been setting up to guarantee the best modulation quality.

• Sync restore. An internal sync restore circuit (optional) allows to ripristinate a perfect video sync pulse also with corrupted or scrambled video signal input.

• PLL sound carrier. Sound and video intercarrier is synchronized by PLL to video line frequency for maximum stability and negligible intermodulations.

• Stereo and dual sound. Available with Stereo and/or dual sound facility (Zweiton or Optional Nicam-Digital) for stereo or dual sound transmissions.

• Panel metering. Full front panel metering (LCD micro controller) and control for complete setting and performance checking.

• Remotely Audio Mode synchronization (Optional). Input for external Audio Mode synchronization is available for Audio Mode system (Stereo/Dual/Mono).


Technical Overall Specifications :

• IF Specifications :
- Output IF frequency : 38.90MHz (TCXO Controlled)
- Vestigial Side Band Filter : 38.90MHz SAW High Precision X’TAL Filter
- Output level of video carrier : -10 to +10dBm adjustable
- Output frequency stability : ± 50 Hz
- Vision Modulation : AM Negative (A5C) according to CCIR B and G standards
- Output impedance : 50 Ω
- Output connector : BNC
- Harmonic/Spurious emissions : < -60 dBc
- TV Standard Transmission : PAL-B/G (CCIR Standard)
- Aural Modulation : FM (F3)
- Aural Sub Carrier Freq. : 5,5Mhz and 5,75Mhz
- Aural Pilot Sub-Carrier : 117H for Stereo Mode, 271H for Bi-Lingual Mode
- A/V Carrier Ratio : Adjustable from 29dB to 13dB (18dB Standard)

• Video Specifications :
- Input Level : 1Vp-p
- Input Impedance : 75 Ohms, Unbalance
- Video Connector : Unbalanced, BNC
- Input Return Loss : >34dB (from 0 - 5.5Mhz)
- Modulation Mode : AM-VSB, Negative Polarity
- Video Processor : White/Black Clipper, Noise Eliminator
- Percentage of Modulation : < 87.5%
- Field-Time Waveform Distortion : < 2%
- Line-Time Waveform Distortion : < 2%
- 2T Sine-Squared Pulse : < 2%
- Luminance Non-Linearity : < 10%
- Blacking Level Offset : < +/- 2.5%
- Differential Gain : +/- 3%
- Differential Phase : +/- 3 Deg.
- C/L Gain Inequality : < 10%
- C/L Gelay Inequality : < +/- 30nS
- Sequence Random S/N : > 50dB
- Periodic Disturbance S/N ratio : > 50dB

• Audio Specifications :
- Input level : L and R, 0dBm to +/- 6dBm
- Input impedance : 600 Ohms, Balanced
- Input Connector : XLR, Balanced
- Modulation mode : Zweiton/Nicam-Digital Stereo, Bi-Lingual, Mono
- Pre-emphasize : 50uS, 75uS (Selectable)
- Frequency deviation : +/- 50Khz
- Audio Processor : Deviation Limiter at Peak Level
- Harmonic distortion : < 1% (30Hz – 15Khz) (100% Modulation)
- Audio Response : +/- 1dB (30Hz – 15Khz, 50uS, 50% Mod.)
- FM S/N : > 60dB (at 1Khz, 100% Modulation)
- AM S/N : < -50dB (0% Modulation)
- Inter Carrier S/N : < -45dB (at 100% Modulation)
- Sync Parasitic AM S/N : > 40dB
- Visual to Aural Ratio : < 10%

* RF Specifications :
- Output power (peak-sync) : 10Wps - 600Wps (depend on models)
- Frequency Range : UHF/VHF Band (CCIR/FCC Standard)
- RF output impedance : 50 Ohms
- RF Output Connector : N-Type (depend on models)
- Frequency Stability : 500Hz / 3Months
- Output Power Offset : +/- 0,25dB
- Inband Intermodulation : < -52dB
- Stray Output In : < -60dB
- Stray Output Out : ≤ -40dB

• Environment Factor :
- Working Temperature : -10 to +45 Deg. Celcius
- Relative Humidity : < 95% ( No Condensation at 25 Deg. Celecius)
- Atmosphere Pressure : 86 – 106Kpa
- Cooling : Forced Air Cooling
- Power Supply : AC 220V, 50Hz
- Dimension : depend on models






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